Sand-blast.



E. D. OBRIEN.

SAND BLAST.

APPLICATION r1150 JAN. 4. I915.

L11, Patented ]Dec.14,1915.

SAND-BLAST.

arcane.

Specification of Letters Patent.

Patented Dec. Mt, TWW.

Application filed January t, 1915. Serial No. 397.

To all whom it may concern:

Be it known that I, EDWARD D. OBnmn, a citizen of the United States, residing at "Seattle, in the county of King and State of Washington, have invented certain new and useful Improvements in Sand-Blasts; and T do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make anduse the same.

This invention relates to improvements in nozzles for sand blasts, and particularly to an improved nozzle attachment for rough finishing paper and fiber, including materials in which animal products enter, or metallic substances.

A further object of the invention is that by removably attaching this improved nozzle, to a nozzle of any ordinary preferred type of sand blast machine, the same may be utilized to perform the aforesaid operation.

Another object of the invention is to have in a device of this character a discharge pipe for the sand unused in the roughening operation, whereby the sand will be directed downward to the floor and not scattered about to the discomfort and annoyance of the operator of the device.

A still further object of the invention is an improved blast retarder in the outlet of the device that may beeasily and quickly removed when worn, and replaced by a fresh one to prevent any choking or the consequent uneven distribution of the sand on the surface to be roughened.

With these and other objects in view, the invention consists of certain novel features of construction, and the combination and arrangement ofparts as will be more fully described and claimed.

In the accompanying drawings, Figure 1 is a side elevation partly in longitudinal section; Fig. 2 is an end viewof the device; Fig. 3 is 'a' transverse vertical section on line 3-.3 of Fig. 1; and Fig. 4 is a side elevation partly in longitudinal section of a slight modification of the invention.

Referring more particularly to the drawings, 1 designates any preferred form of sand blast 'nozzle in a restricted outlet comthe nozzle 1, by any desired means.

mon to devices of that character. The nozzle 1 is attached at its inner end to air and sand pipes leading from the sand blast Inachlne and from which air under pressure and sand carried thereby, is forced through its outer end. To the outer restricted end of the nozzle of the outlet is removably attached a hood or casing 2 by any desired means. Tn the drawing the hood is shown having a set screw attachment to the nozzle in Fig. 1, and a screw threaded attachment in Fig. 4, but any preferred movable attaching means may be used.

The hood 2 has a dome or knob-shaped closed upper end, with alining apertures 6 and 7 therethrough. The opening 6 is for the reception of the restricted end of the nozzle 1 and may have an internally threaded outwardly projecting flange as shown in the drawings, or any other necessary means for removably attaching the hood to the nozzle. The opposed aperture 7 is a circular threaded opening adapted to receive a correspondingly shaped threaded perforated disk 8. The dome or knob-shaped top of the hood is gradually increased in width from the aperture 6 surrounding the nozzle inlet to the wall of its alining aperture 7 in which the perforated disk 3 is mounted. The lower portion of the hood is circular and extends downwardly from said dome or knob at right angles to the apertures therethrough, and terminates in a discharge opening 4. f

In operation the improved device is removably attached over the restricted endrfif e sand carried by the air under the usual pressure by sand blast machines will be projected from the restricted end of the nozzle, held in the apertures 6, across the top of the hood and against the inner face of the perforated disk 3, removably secured in the alining apertures? with great .force. This disk will act as a checkand will reduce the force and volume of the sand that is finally vegetable fiber, materials in which animal products enter, or metallic substances, that can be spaced a short distance from the outer" side of the same to beroughened.

A certain quantity of the sand from the sand blast nozzle, will be projected directly across the hood, and through the perforations in the disk, while the remaining portion of the sand will strike against the flat inner side of the disk between the perforations, rebound back into the hood, and be carried ofl" by the discharge pipe. This flat surface of the disk forms a stop for the sand that strikes against it, so that, only the particles of sand that are in the direct line of the perforations will be discharged from the hood, thereby greatly reducing the volume of the blast when passed through this attachment. As the particles 'of sand which strike the flat side of the disk rebound, the same will to a certain degree retard the force of the-blast as will be obvious, and this action will reduce the velocity of the sand finally discharged to the required pressure necessary for the operation of this device for the purpose described.

'The sand not pressed through the perforations of the disk 3, drops down through the lower portions of the hood 2 and out through the discharge opening. 4 in the lower end of said hood, said discharge of the unused sand being facilitated by the dome or knob shaped top of the hood which acts as a guide for thesand rebounding upwardly from the disk against its surface and hence tends to carry the sand around the in coming stream of fresh sand and air, down to the discharge opening below the same.

The perforated disk 3 is threaded in the sideof the' hood so that it may easily be removed when worn or choked and a new one substituted therefor. The hood 2 is removably attached to the nozzle 1 so that it may easily be taken off when it is desired to have the full force of the blast for the ordinary purposes of the machine.

In Fig. 4 of the drawings is sl' own a modified form of the invention in wl .ch the lined with india rubber 8.

dome or knob-shaped top of the Lood is d A section of this lining is perforated to aline with the perforations in the disk 3 when it covers the disk, and an aperture isformed in its wall directly'opposite theperforated section to receive the restricted end of the nozzle 1. This india rubber lining protects the perforated disk and inner wall of the dome or knob of the hood, against wearing action of the sand and air, as is well known. in the art and thereby lengthens the life and efficiency of the attachment. The lower portion of the hood by being circular and projecting downwardly, directs the sand, not forced through the perforations in the disk, downward through the same and out onto the floor in a continuous stream. This discharge eliminates all scattering of particles of unused sand that formerly caused great inconvenience and annoyance to the operator of the machine.

This device is a simple and inexpensive attachment whereby an ordinary sand blast nozzle may be made to perform a function that ordinarily requires a specially constructed machine for that purpose I claim:

1. The combination of a sand blast nozzle, a hood independent of and removably attached to the discharge extremity of said nozzle, and means carried by said hood for reducing the volume and velocity of the blast in its passage therethrough, said means including a perforated disk having a fiat inner side disposed in a plane at right angles to the longitudinal axis of the nozzle.

2. In combination with a sand blast nozzle, a hood removably attached to the discharge extremity of said nozzle, and a foraminous member in said hood having a flat inner side disposed in a plane at right angles to the longitudinal axis of said discharge extremity inalinement with and spaced from the said discharge extremity of the nozzle, and said member being of greater diameter than the nozzle.

hood.

4. The. combination of a sandblast nozzle, a hood having a dome or knob-shaped closed top and an open bottom, said hood havmg alining inlet and outlet apertures near its top. means whereby the nozzle may be removably secured in the inlet aperture, a perforated disk removably secured in the outlet aperture of said hood, and an integral pipe projecting from the lower end of the ome" or knob-shaped toptof the hood to discharge unused sand therethrough.

5. A sand blast nozzle attachment comprising a hood having alining openings therethrough adapted to receive the outlet of the nozzlethrough one of said openings, a discharge at the bottom of said hood, and a removable perforated disk in the other opening having a flat inner side disposed in a plane at right angles to the longitudinal axis of the outlet of the nozzle.

6. The combination of a sand blast nozzle, a hood removably attached thereto havmg alining inlet and outlet openings across the top thereof and a discharge opening in thebottom of the same between said openings, said hood being removably attached to the sand blast nozzle at the inlet opening, a perforated disk in the outlet opening having its inner flat side dlisposedt in a plane at set my hand in presence of two subscribing right anlgiles to fthe longitudinai :hxii on: the witnesses. I nozz e, t e per orations in sai is eing straight with their longitudinal axes dlis- W UBRIEN' t posed in planes at right angles to the said Witnesses:

flat side of the &isk. JOHN R. PARKER,

In testimony whereof I have hereunto LioN Gmsnn. 

